lawenforcement,of deep concern of ammunition, guns and working bombs these men had. they were so disciplined. >> any indication of another sleeper cell? >> right now, no evidence of a broader plot involving more people here, but law enforcement officials say they can't take that chance. the investigation is full tilt to find that out. >> okay, pierre, thanks very much. let's get more on this from our team of analysis from our team, dan abrams, brad garrett and richard clarke. dan, let me begin with you. the question about the questioning of the witness, at least at first he will not be read his miranda rights. >> that's right. you heard pierre talk about this public safety exception. basically the supreme court has recognized that, in some cases, if there's the possibility of an imminent threat that you can ask limited questions without further reading someone their miranda rights and that's what they're saying here, now, down the road, will someone challenge it and say this shouldn't have happened? sure. courts may have to resolve the specifics in this case later. but there is n